*{
    margin:0px;
    padding: 0px;
}
body{
    background-color: snow;
}
.wrapper{
    width: 80%;
    height:1000px;
    background-color: antiquewhite;
    margin: 0px auto; /* 上下、左右*/
}
.heading{
    margin:0px;
    width:100%;
    height:90px;
    background-color: snow;
    margin:0px auto;
}
.heading_title{
    float: left;
    font-family:Arial,Harrington,sans-serif;
    font-size: 30px;
    color:burlywood;
}
.heading_nav{
    padding-bottom:30px;
    padding-top:30px;
    width:100%;
    height:30px;
    position: relative;
}
ul{
    margin-left:40px;
    float:left;
    list-style-type:none;
    padding-top: 6px;
    padding-bottom: 6px;
}
li{
    padding-left:10px;
    display: inline;
}
a:link,a:visited{
    font-weight: bold;
    color:darkgray;
    text-align:center;
    padding:6px;
    text-decoration: none;
}
a:hover,a:active{
    color:dimgray;
}
.heading_img img{
    border-radius: 30px;
    display: inline;
    width:26px;
    height:26px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.2);
    float: right;
}
.heading_soptlight form{
    float: right;
    width:80px;
    height:26px;
    position: relative;
    margin-right:100px;
}
form input{
    height:26px;
    border-radius: 30px;
}
.body{
    padding:30px;
    height:30px;
    width:30px;
}
.body_title h3{
    font-size:30px;
    font-family:Arial;
}
.body_title p{
    margin-top:20px;
    margin-bottom:20px;
}
.footing{
    padding-top:20px;
   /* padding-bottom: 50px;*/
    text-align:center;
    font-size: 10px;
    color:gray;
}